Manifold



sept- 15, 1942- G. A. cHEDlsTER A2,295,832 M MANIFOLD Filed April 6,1940 2 Sheets-Sheet 1 INVENTOR.

GUY ,4. CHED/STER I ATTORNEY.

Sept 15, 1942- G. ,A. CHEDISTER 2,295,832

MANIFOLD Filed April 6, 1940 sheets-sheet 2 INVENTOR GUY A. C/7'fD/` T'RBYv Z A j z ATTORNEY.

Patented Sept. 15, 1942 UNITED STATES PATENT OFFICE (Cl. 12B-52) 8Claims.

This invention relates to manifolds and has particular reference tomeans for connecting a carburetor to the intake manifold of an internalcombustion engine.

It is an object of this invention to provide means for connecting acarburetor having two transversely positioned ports to a manifoldextending longitudinally of the engine.

It is another object of this invention to provide means for adapting acarburetor designed to be located at one angle relative to an automobileto a motor having a manifold extending at an angle of 90" from the linein which the carburetor is designed to be located.

It is another object of this invention to provide novel means forconnecting a carburetor having dual ports to an engine having a singlemanifold.

Other objects and advantages of this invention will be apparent from aconsideration of the following description and attached drawings ofwhich there are two sheets and in which Figure l respresents a verticaltransverse section of an internal combustion engine with my inventioninstalled thereon;

Figure 2 represents va side elevation of that portion of the engineembodying my invention;

Figure 3 represents a plan View of that portion of the engineillustrated in Figure 2;

Figure 4 r'epre'sents a section taken along the line 4 4 of Figure 3 andlooking in the direction of the arrows; l Figure 5 represents a sectiontaken along the line 5 5 of Figure 3 and looking in the direction of thearrows;

Figure 6 represents an end elevation of a modified type of my invention;

Figure 7 illustrates a side elevation 0f a portion of the structureillustrated in Figure 6;

Figure 8 is a bottom view of the structure shown in Figure 7; and,

Figure 9 represents a section taken along the line 9--9 of Figure 8 andlooking in the direction of the arrows.

Some internal combustion engines, particularly eight cylinder engines,are built with two generally parallel manifolds. One manifold leads tothe last two cylinders at each end of the engine and the other manifoldleads to the four center cylinders. To accommodate these manifolds,carburetors are designed with transversely disposed dual discharge portswhich lead one to each manifold. Since the manifolds and engine usuallyextend longitudinally of the automobile in which they are installed, thecarburetors are provided with float chambers on the front or back ratherthan the sides to equalize the effect of centrifugal force on the fuelin the float chamber as the automobile is driven around corners. Thecontrols are also located so as to be most easily operated while thecarburetor is positioned with its ports transverse to the axis of theautomobile.

'I'he same carburetors as just described may be used on engines havingsingle manifolds, such as six cylinder engines, by making minor changesin the jet sizes and adjustment. However, if the carburetor is turned sothat its ports will be disposed longitudinally over the manifold, thefloat tank and controls will be 90 out of the most desirable position. A

It is desirable for automobile manufacturers producing diiferent cars,such as sixes and eights, to have as many parts as possibleinterchangeable between the several types as this cuts down theinventory of parts that must be supplied and stocked. I have developed asimple part which will make the same carburetor interchangeable onmotors having single or double intake manifolds. lIt is also useful inmounting a carburetor on an engine that is mounted transversely of theautomobile as is sometimes done in buses. By using this part, amanufacturer may avoid going to the expense of designing and stocking anentirely new carburetor.

In Figure 1 I have illustrated an internal cornbustion engine 2B havinga head generally indicated at 22 and a carburetor 24. The head 22 isdesigned for a valveein-head engine and is provided with the exhaustport 26, connecting combustion chamber 28 with the exhaust pipe 39, andwith valve guides 32 through which valves (not shown) pass to controlthe opening and closing of the port 2S. The head 22 is also providedwith cooling water passages 34 and an intake manifold 36 which extendslongitudinally of the head and from which the intake ports 38 (seeFigure 1) extend downwardly to each of the combustion chambers 28. Themotor is provided with a rocker arm cover 39 and a tappet rod passage 4)which provides communication between the engine 2!! and the rocker arms.

The carburetor 2li is provided with two ports communicating with thepassages 42 and 44 shown in Figures 3 to 5 which will be moreparticularly described later and spaced transversely of the engine attheir top portion. The carburetor is also provided with controls 46 anda 4float chamber on the forward side of the carburetor (not shown). Thecarburetor is posiltioned as just explained because that is the positionfor which it was designed to operate most efficiently as described aboveI have provided a cover plate 48 for closing the intake manifold 36,which cover plate is secured to the head'22 by means of bolts (notshown) passed through holes 49 in the bosses 50 formed on the top of thecover plate 48. The cover plate is further provided with a thickened orraised portion 52 having an upper iiange 54. The upper iiange 54 isapertured as at 56 so that the carburetor 24 may be bolted to the upperflange. The thickened portion 52 has formed within it the two passages42 and 44 mentioned above. It will be noted that the passage 42 curvesfrom a position above and toward the outer side of the-carburetor 36downwardly and into a position directly over the manifold 36. Thispassage is indicated in Figures 1 through 3 by dot and dash lines. Theother passage 44 starts at a position almost directly over the manifold36 and curves downwardly and for- `wardlyto the manifold-36. Thispassage is illustrated in Figures f1- throughY 3fby the heavy dottedlines.

As is illustrated in Figures 4 and 5, passages V44-and 42 AhaveYapproximately the same length and shape. -'Ihisinsures that if thecarburetor discharges two like streams of fuel and airmixture-into thepassages 42 and'44, the two streams will'still bealike when-dischargedinto the manifold. Thefpassage-42 is curved yfrom themanifold-fppwardlyand-outbeyond the side of the manifolddue-to the fact that thecaburetor24 mustfbe setlto vthe side of Ythe-head 22 in order tofcleartthe rocker arm cover 38.

In Figure 6 I have illustrated a portion of an -L-head 'type motor' 66yhaving head 62 secured thereon-inthe-normal-fashion. The motor block60'is -provided with an intake manifold 64 extending x'longitudinally ofthe motor block and from 'which-the intake ports 66 extend to each of=the cylinders lin the block. The vhead 62 is provided lwith Aftwovertical passages 63 which disohargeintothe-manifold 64. The carburetor104s much the same as the'carburetor illustrated in Figure land isprovided with two downwardly discharging ports.

morder to linstallthis carburetor 16 on the headEB-so that the-ports ofthe-carburetor may be positioned laterally with respect'to the engine,I-have provided-the spacer block 1-2 which has a lower fiange I4apertured at 1:6 sothat itfcan be bolted to'the head kv62 and-alsoprovided with an upper flange A16 apertured as at 86 so that it maybebolted to thefcarburetor 10. IIhe upper fiange -18 of the spacer vblock-12 is-provided with two transversely spaced openings 62 and 84 whichare arranged to Y`register `withthe ports and the undersideof-thecarburetor I6. The outer port 82=communicates witha spiral passage 86which vcurvesdownwardly and tothe rear'to a lower port -88 -'in Ithe-lower flange `'I4 of lthe spacer block I2. `'Ihe-innerport .84 curvesdownwardly in avspiral'passagelf `to the .forward port 92 `indie-lowerflange J4. These passages 86 and .96 dischargefinto-the.intake manifold64 and are approximately equal in length and curvature so as to retainthemixture balance between the twofstreams of fuel land air :passingthrough the two passages.

It r`willbe noted that sinoe'the engine shown inFigure 6 is an L-headengine, the carburetor 10 mayfbepositioned-directly over the intakemanifold'64 so that the-ports `82 and 84 in the upperflange ofthe spacer12 are located approximately-over the vintake manifold 64. I have foundthat the addition of the spiral passages into the path of the fuelmixture, both in the L-head and valve-in-head engines, does not detractfrom the eiciency of the manifold systems as a whole and may even betterthe manifolds characteristics due to the swirling motion imparted to themixture by the spiral passages.

While I have described my invention in some detail, I intend thisdescription to be an example only and not limiting upon my invention towhich I make the following claims.

I claim:

vl. In combination with an engine having a manifold along the topthereof, a carburetor for said engine defining two ports positioned in aline transverse to said manifold, and a cover for said manifold definingtwo passages opening in two transversely positioned ports in the top ofsaid cover and in two longitudinally positioned ports over saidmanifold, said carburetor being secured to said cover 'over said vtopports.

2. In combination with an engine having'a manifold formed in its topsurface and positioned longitudinally of said engine, a carburetor forsaid engine defining two ports positioned in a line transversely of saidengine, a cover for said manifold and a thickened portion formed on saidcover, said thickened portion defining a pair of passages lopeningintransversely located ports at the top of said thickened portion andopening in longitudinally positioned ports over said manifold.

3. In combination .with a valve-in-head engine, a head for said enginehaving valve mechanism along one side ofthe top thereof, a manifoldformed along the other'side of the top thereof, a cover for saidmanifold, said cover defining two ports positioned longitudinally ofsaid manifold, ducts formed in said cover and connecting with saidports, one of said ducts curving upwardly from one of said ports to apoint over the other port, the other duct curving upwardly and .+o theside to a point adjacent the end of said first duct, and acarburetor'having two ports connecting with the upper ends of saidducts.

4. In combination with a valve-in-head engine, a head for said enginehaving valve mechanism along one side of the'top thereof, a manifoldformed along the other side of the top of said head, a cover for saidmanifold, said cover defining two ports positioned longitudinally ofsaid manifold, ducts formed in said cover, one of said ducts curvingupwardly from one of said ports and extending longitudinally of saidcover, the other of saidducts curving upwardly from the other of saidports and transversely away from said valve mechanism, and a carburetorhaving two ports registering with the upper ends of said ducts.

5. In combination with an engine having a manifold along one sidethereof, a cover for said manifold defining two ports longitudinally ofsaid manifold, a pair of ducts formed'in said cover and connecting withsaid ports, one of said ducts curving upwardly and over the other ductandthe other duct curving upwardly from beneath said first duct to apoint adjacent the upper end of said first duct.

6. In combination with an L-head engine having a manifold in the topthereof, a head for said engine and covering said manifold, said coverdefining two ports longitudinally of said manifold, a spacer memberpositioned on said head and defining a pair of ducts connected one toeach of said ports, said ducts curving upwardly in a quarter spiral turnabout each other, and a carburetor having two ports cooperating Withsaid ducts secured to said cover.

7. In combination with an engine having a manifold formed in its uppersurface and positioned longitudinally of said engine, a cover for saidmanifold defining inlet ports to said manifold, a spacer member securedto said cover over said inlet ports, said spacer defining a pair ofducts opening in transversely located ports at the top of said spacermember, and longitudinally located ports at the bottom of said spacermember.

8. In combination with an engine having a manifold, a carburetor havingtwo ports, a closure for said manifold defining a second pair of ports,and means for supporting said carburetor over said manifold with saidpairs of ports positioned along askew lines, said supporting meansdening a pair of spirally arranged passages con- 10 necting said pair ofports.

GUY A. CHEDISTER.

